1.1 Geology of the Cave
The Za Hájovnou Cave (49° 40´ N, 16° 55´E) is a former sinkhole located in Javoricko Karst, Moravia Region of the Czech Republic (Lundberg et al., 2014; Musil, 2014) (Fig. 1). The Javoricko Karst is formed by light-grey-colored massive Devonian limestone that overlies Pre-Cambrian phyllite (Lundberg et al., 2014; Musil, 2014). Spranek and Javoricka are two rivers that flow through the Jarovicko karst. While Za Hájovnou Cave is situated on the north-western bank of the Javoříčka river on the southern slope of a Pani Hora hill (Lundberg et al., 2014; Žák et al., 2018), both Spranek and Javoricka watershed may have contributed to the sediment development in this cave (Fig. 1).
The Za Hajovnou cave is approximately 500 m long system (Musil, 2005; Bábek et al., 2015). The cave’s corridors were explored previously in a total length of ~200 m (Musil, 2014) (Fig. 2). The cave currently consists of two main parallel corridors with a slightly different sedimentological record (Musil et al., 2014); the first corridor (local name is “Excavated Corridor” which is used to be sinkhole entrance) and the other corridor (local name is “Birthday Corridor”) has a separate entrance. These two corridors are connected by the Connecting Passage Corridor (Fig. 2). Sediments from the Excavated Corridor continue to Birthday Corridor and partially filled the Connecting Passage Corridor (Musil et al., 2014) (Fig. 2).